:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #ff4c00;
    --secondary-color: #ff6d2e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
}

.challenge-logo {
    width: 50px;
    height: auto;
    margin-right: 1rem;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--accent-color);
}

section, .container, .card, #quiz-container, #flashcard-container {
    background-color: var(--bg-color);
}

.button, button, input[type="submit"] {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.button:hover, button:hover, input[type="submit"]:hover {
    background-color: var(--secondary-color);
}

input[type="text"], input[type="email"], textarea {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--accent-color);
    border-radius: 3px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

nav {
    background-color: var(--accent-color);
    padding: 1rem;
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: var(--bg-color);
    text-decoration: none;
    margin-right: 1rem;
}

nav a:hover {
    text-decoration: underline;
}

.center-button-container {
    text-align: center;
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.conjugation-info-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.conjugation-info-button:hover {
    background-color: var(--secondary-color);
}

.icon-button {
    background: none;
    border: none;
    color: var(--accent-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.icon-button:hover {
    color: var(--secondary-color);
}

.primary-button {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-weight: bold;
}

.primary-button:hover {
    background-color: var(--secondary-color);
}

.secondary-button {
    background-color: transparent;
    color: var(--accent-color);
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--accent-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.secondary-button:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

#back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#back-to-top:hover {
    background-color: var(--secondary-color);
}

#quiz-container {
    background-color: var(--bg-color);
    padding: 2rem;
    border-radius: 10px;
    margin-top: 2rem;
    border: 1px solid var(--accent-color);
}

#question-container {
    margin-bottom: 1rem;
}

#user-answer {
    width: 100%;
    padding: 0.5rem;
    margin-top: 1rem;
}

#submit-answer, #next-question {
    margin-top: 1rem;
}

#result {
    margin-top: 1rem;
    font-weight: bold;
}

.correct {
    color: #4CAF50;
}

.incorrect {
    color: #F44336;
}

.tagline {
    background-color: rgba(255, 76, 0, 0.1);
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 2rem;
    text-align: center;
}

.tagline h3 {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.tagline p {
    font-style: italic;
}

#flashcard-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 2rem;
}

#flashcard {
    width: 300px;
    height: 200px;
    position: relative;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    cursor: pointer;
}

#flashcard .front,
#flashcard .back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#flashcard .front {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

#flashcard .back {
    background-color: var(--bg-color);
    color: var(--accent-color);
    transform: rotateY(180deg);
}

#flip-card,
#next-card {
    margin-top: 1rem;
}

@media (max-width: 600px) {
    main {
        padding: 1rem;
    }

    .header {
        flex-direction: column;
    }

    .challenge-logo {
        margin-right: 0;
        margin-bottom: 1rem;
    }

    h1 {
        font-size: 2rem;
        text-align: center;
    }

    .share-button, .home-button {
        display: block;
        width: 100%;
        margin-right: 0;
        text-align: center;
    }

    #flashcard {
        width: 250px;
        height: 150px;
    }
}